Centering device for flask-patterns.



PATENTED MAY 2, 1905.

G. W. JONES. GBNTERING- DEVICE FOR FLASK PATTERNS.

APPLICATION FILED JUNE 11,1904.

2 SHEETS-SHEET 1 I if I WITNESSES.-

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N0. 789,032. v PATENTED MAY'Z. 1905.

G. W. JONES. GENTERING DEVICE FOR PLASK PATTERNS.

APPLICATION FILED mm: 11.1904. 2 SHEETS-SHEET 2.

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WITNESSES: [NVENTOR mmw g NTTED STATES Patented May 2, 1905.

PATENT Trice.

GEORGE WALLACE JONES, OF GATE CITY, ALABAMA.

SPECIFICATION forming part of Letters Patent No. 789,032, dated May 2, 1905.

Application filed June 11, 1904. Serial No. 212,208.

To aZZ whom it may concern:

Be it known thatI, GEORGE WALLACE J ONES, a citizen of the United States, residing at Gate City, in the county of Jefferson and State of Alabama, have invented new and useful Improvements in Centering Devices for Flask- Patterns, of which the following is a specification.

This invention is a device used in the making of molds for cast-iron pipes to center and guide the pattern around which the sand is put in the flask.

The object of the invention is to provide an improved centering and guiding device for the pattern and one that is capable of use on patterns of various sizes. This device dispenses with the use of the cast-iron centeringsleeve heretofore used.

The invention is illustrated in the accompanying drawings, in which Figure 1 is a plan view of a pair of flasks, each of which is provided with my newly-invented device. Fig. 2 is a vertical section thereof on the line 2 2 of Fig. 1. These views show, respectively, the pattern in different positions. Fig. 3 is asectional view of my newlyinvented device removed from the flask.

Referring specifically to the drawings, B indicates a flask of a pipe-molding apparatus, and A the pattern which is centered therein.

A indicates a ring or circular frame with four boxes B cast thereto. These boxes are diametrically disposed and have radial and transverse recesses extending horizontally therethrough. Plugs or blocks D work in the radial recesses and are arranged to project or be moved beyond the inner ends of the boxes. IV edges Eare located to work laterally in the transverse recesses behind the plugs D, and these wedges in action force the plugs D radially toward the center. i

G indicates a ring provided with handles C, whereby it may be manipulated. This ring is arranged above and concentric with the circular plate Aand rests upon the top of the boxes B. Itis connected by cap-bolts H to the wedges E, the cap-bolts extending through slots (indicated at H) in the top of the boxes. It is obvious that when the ring G is turned in a circular direction the wedges E will be shifted thereby, which will produce corresponding motion of the plugs D toward the center or permit opposite motion from the center.

In centering the pattern the circular plate A is clamped onto the flange of the flask B and the pattern is put in place. Then to center the pattern the ring G is turned by the handles until the plugs D contact with the sides of the pattern, whereby the latter is centered and supported with respect to the flask. It is, perhaps, needless to say that the plugs D are of exactly the same length, and the wedges E and associated parts are duplicates, so that the movement of all the plugs is identical. The parts remain in the position described until the pattern is drawn. The pat tern is of the kind having a tapered butt or end, as indicated at A and in order to automatically release the centering device when the swell or incline is reached the following means are employed. The plate A has formed thereon at diametrically opposite points pairs of bosses K and Q. The former are bored horizontally to receive a bolt L, which holds and acts as a pivot fora bent or bell-crank lever I, which turns in a vertical plane. One arm of this lever hangs down behind a lever J, which is pivoted at M upon the boss Q, which is tapped to take the pivot-bolt. The leverJ is connected by a link N to the wedge E, the connections being pivotal to allow the necessary movement. The other arm of the bellcrank lover I projects beyond the plate A, within the same, in a downwardly-inclined direction to bring it upon the head F of the trip bar F, which hangs through a hole in the flange of the bell-head X. The head F is bigger than the hole, so that the trip is supported by the head resting on the flange. The hole is inclined so that the lower end of the trip hangs down beside and against the pattern A. The trip F is capable of vertical movement and is supported by the bellhead X. When the pattern A is being drawn from the flask, the inclined butt or portion A thereof comes in contact with the lower end of the trips F, which are by the pressure forced upwardly, and in rising they turn the bell-crank levers I, which by sliding contact with the levers J turn the latter levers and move the wedges, the direction of movement being to withdraw the wedges, so that the plugs D are permitted to move outwardly, which they do when they are reached by the tapered portion A of the pattern. The pattern may thus be drawn completely out without removing the centering device from the flask.

The device is capable of use with patterns of various sizes, such capability being only limited by the size of the wedges and consequent range of movement of the plugs. The plugs not only center the pattern, but also form an exact and complete guide for the movement of the pattern as it is drawn.

The automatic device above described, to release the centering-blocks as the patternis drawn, may be omitted, if desired, inasmuch as the wedges may be operated by hand by movement of the ring G in the reverse direction. In use with patterns which do not have the enlarged butt or end the automatic devices referred to may be omitted and the remaining parts used for the purpose of centering and releasing the pattern by hand operation.

The wedge action is quick and positive, and since the action of each wedge is necessarily identical the adjustment is consequently more exact than when separately-operated devices, such as screws, are used.

Various modifications may be made in the details of construction without departing from the scope of the invention, which is not limited to the exact construction shown nor otherwise than is indicated in the following claims.

What I. claim as new, and desire to secure by Letters Patent, is

1. The combination with a pipe-flask and a removable pattern. therein, of a centering device comprising a frame on the flask, blocks movable on the frame toward the center and adapted to contact with the pattern to center the same, and means automatically actuated by the withdrawal of the pattern to release said blocks.

2. The combination with a pipe-flask and a removable pattern therein, said pattern having an enlarged lower end or butt, of a frame on the flask, blocks movable on the frame against the pattern to center the same, and means actuated by the enlarged portion ofthe pattern to retract said blocks when the pattern is drawn.

3. A centering device for flask-patterns, comprising a frame, blocks on the frame movable radially with respect to the common center, supporting-wedges behind the blocks, and a trip connected to the wedges and constructed to retract the same, and adapted to be actuated by withdrawal of the pattern.

4. The combination with a pipe-flask, and a removable pattern therein having an enlarged lower portiomof a frame around the pattern at the top of the flask, radially-movable centering-blocks on the frame, constructed to contact with the pattern, supporting-wedges behind the blocks, a trip extending within the flask, in the way of the said enlarged portion, and connections between the trip and the wedges, acting to retract the wedges when the enlarged portion strikes the trip.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

GEORGE WALLACE JONES. l/Vitnesses:

FRED BRUoKER, R. H. PRITCHARD. 

